Start up Idle
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Junior Member
Joined: Oct 2006
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From: CT
Car: 1992 Z28 Aniv. Edition
Engine: 5.3 L33 Turbo
Transmission: Tremec T56
Axle/Gears: 3.27 Borg 9Bolt
Start up Idle
Does anyone know how i can allow my car to enter a high idle for the first 10 seconds or so upon startup and slowly settle to the desired idle speed, I am using Tuner Pro and am tuning a 730 ECM, my cam doesnt like to start off idling slow, an initial 1400 rpm for a few seconds sets the idle nice when i take my foot off the petal. Thanks!
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Joined: Sep 2003
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From: Texas
8D has 2 idle offset vs MAT tables.
I believe one for cold start only which is this:
At the other is for hot restart and last for 25 seconds.
It is:
I believe one for cold start only which is this:
Code:
;------------------------------------------------------------
; IDLE SPEED TIME OUT IAC STEPS vs COOLANT or MAT
;
; TBL = STEPS
;------------------------------------------------------------
; VAL STEPS Deg c
;----------------------------------
L86A1: .byte 0x1E ;=30, 30 -40
.byte 0x1E ;=30, 30 -28
.byte 0x1E ;=30, 30 -16
.byte 0x1E ;=30, 30 - 4
.byte 0x1E ;=30, 30 8
.byte 0x1E ;=30, 30 20
.byte 0x1E ;=30, 30 32
.byte 0x1E ;=30, 30 44
.byte 0x1E ;=30, 30 56
.byte 0x28 ;=40, 40 68
.byte 0x32 ;=50, 50 80
.byte 0x3C ;=60, 60 92
.byte 0x3C ;=60, 60 104
.byte 0x3C ;=60, 60 116
.byte 0x3C ;=60, 60 128
.byte 0x3C ;=60, 60 140
.byte 0x3C ;=60, 60 152 It is:
Code:
;----------------------------------
; PID HOT SA RETARD PARAM'S
;----------------------------------
L8672: .byte 0x19 ;=25, IF ENG RUN TIME < 25 SEC ENABLE HOT SA RETARD ; DRef: 0xB9D6
; and HOT RESTART CMD SPEED vs MAT TBL is added to CMD'd idle spd
;---------------------------------------------------------
; HOT RESTART CMD SPEED vs MAT
;
; VAL = RPM/12.5
;---------------------------------------------------------
; VAL SPD DEG C
;------------------------------
L8673: .byte 0x06 ;= 6, 75 -40
.byte 0x06 ;= 6, 75 -28
.byte 0x06 ;= 6, 75 -16
.byte 0x06 ;= 6, 75 - 4
.byte 0x06 ;= 6, 75 8
.byte 0x06 ;= 6, 75 20
.byte 0x06 ;= 6, 75 32
.byte 0x06 ;= 6, 75 44
.byte 0x06 ;= 6, 75 56
.byte 0x08 ;= 8, 100 68
.byte 0x0C ;=12, 150 80
.byte 0x10 ;=16, 200 92
.byte 0x10 ;=16, 200 104
.byte 0x10 ;=16, 200 116
.byte 0x10 ;=16, 200 128
.byte 0x10 ;=16, 200 140
.byte 0x10 ;=16, 200 152
;------------------------------------------------------------ 
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Car: 1990 Corvette
Engine: 415
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that would be also interesting for me..
how would you have to modify the tables, to get a higher idle speed with cold engine on start up?
thank you
how would you have to modify the tables, to get a higher idle speed with cold engine on start up?
thank you
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From: In reality
Car: An Ol Buick
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Joined: Feb 2002
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From: Prince Albert, Saskatchewan, Canada
Car: 1987 Trans Am GTA
Engine: 357ci Stealth Ram - Under Pressure
Transmission: Built 700r4/Pro Yank 3400 Extreme
Axle/Gears: 9-Bolt 3.27
I had a similar problem. When my car was cold, it would start up, rpms would flare to 1400 then would instantly die. I could keep it running by playing with the pedal - bringing the rpms up to 1800.
When I tried to start it after the first failed attempt it would always start up and idle down fine.
When the car was warm it always started up then idled down fine.
I solved this issue by adding more startup enrichment fuel at colder temps and increasing the delay time before it starts to decay out.
If I only added more Startup Fuel without increasing the Decay Delay it would start then run rough and die out.
The two tables I used were Enrich Startup Vs. Temp and Enrich Startup Decay Delay Vs. Coolant. I adjusted these at cooler temps.
When I tried to start it after the first failed attempt it would always start up and idle down fine.
When the car was warm it always started up then idled down fine.
I solved this issue by adding more startup enrichment fuel at colder temps and increasing the delay time before it starts to decay out.
If I only added more Startup Fuel without increasing the Decay Delay it would start then run rough and die out.
The two tables I used were Enrich Startup Vs. Temp and Enrich Startup Decay Delay Vs. Coolant. I adjusted these at cooler temps.
Thread Starter
Junior Member
Joined: Oct 2006
Posts: 37
Likes: 0
From: CT
Car: 1992 Z28 Aniv. Edition
Engine: 5.3 L33 Turbo
Transmission: Tremec T56
Axle/Gears: 3.27 Borg 9Bolt
idle
mike, when did you make those changes, because i believe i had you send me your current binary last week whitch runs pretty nice, the car starts and idles but its a bit rough, i need another thousand or so rpms for another 20 seconds to get a nice idle going without running real rough.
Supreme Member
Joined: Feb 2002
Posts: 1,036
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From: Prince Albert, Saskatchewan, Canada
Car: 1987 Trans Am GTA
Engine: 357ci Stealth Ram - Under Pressure
Transmission: Built 700r4/Pro Yank 3400 Extreme
Axle/Gears: 9-Bolt 3.27
mike, when did you make those changes, because i believe i had you send me your current binary last week whitch runs pretty nice, the car starts and idles but its a bit rough, i need another thousand or so rpms for another 20 seconds to get a nice idle going without running real rough.
There is no reason why you should have to idle at 2000+rpm. I had no problems idling at 1300-1400 rpm from a cold start when it was -30*c outside.
Thread Starter
Junior Member
Joined: Oct 2006
Posts: 37
Likes: 0
From: CT
Car: 1992 Z28 Aniv. Edition
Engine: 5.3 L33 Turbo
Transmission: Tremec T56
Axle/Gears: 3.27 Borg 9Bolt
Re: Start up Idle
maybe a 2000 is to much... 1300- 1400 would do it, 1000 isnt quite what i like, it does idle but it needs more... its just so rough for the forst 20 seconds or so...would you show me the changeds you made to your tables?
Joined: Nov 2006
Posts: 1,698
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From: Connecticut
Car: 1987 Camaro, 1986 Trans AM
Engine: V6 2.8 multi-port and V8 5.0 FI
Transmission: 5-Speed and Automatic
Axle/Gears: no idea
Re: Start up Idle
im having similar problems. car has rough time finding idle then dies unless i give it gas. on 3-4 tries it will manage to stay on, warm up and idle and run fine.
any suggestions on what i can do step by step?
any suggestions on what i can do step by step?
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